Sunamp Thermal Battery
The Sunamp thermal battery is a compact, highly efficient energy storage system that provides instant, mains-pressure hot water on demand using a special non-toxic phase change material (PCM) instead of a large water tank. It is designed to work with renewable energy sources and standard grid electricity to save space, reduce energy bills, and lower carbon emissions.
Space-Saving Design
The Sunamp battery is up to four times smaller than an equivalent conventional hot water cylinder, making it ideal for homes with limited storage space. It's typically a slim, rectangular unit that can fit in a small cupboard or utility space.
Energy Efficiency & Cost Savings
It has ultra-low heat losses, significantly better than traditional cylinders, which reduces energy waste and lowers running costs. By using smart technology, it can be charged during off-peak electricity hours or with excess solar PV generation, further reducing energy bills.
Instant, Mains-Pressure Hot Water
The system heats fresh water instantly as it flows through a heat exchanger, providing high flow-rate, mains-pressure hot water (e.g., for powerful showers) without needing a large, constantly heated storage of water.
Environmentally Friendly
It uses a safe, non-toxic, non-flammable salt-based PCM that is fully recyclable at the end of its life. Using it with renewable sources helps transition to a gas-free, low-carbon home.
Low Maintenance & Long Life
The battery requires no mandatory annual maintenance and is protected against the risk of legionella bacteria because it doesn't store large volumes of stagnant water. The internal PCM is engineered for over 40,000 charge cycles, providing a lifespan of 50+ years.
Flexible Compatibility
It can integrate with various energy sources, including solar panels (PV), air source heat pumps, ground source heat pumps, and electric boilers. The latest models are future-proofed, allowing you to add renewable sources later without changing the main unit.
How It Works
The core of the Sunamp battery uses Plentigrade phase change material (PCM).
Charging
When the system is charged (using electricity from the grid or renewables), the PCM absorbs heat and changes from a solid to a liquid state, storing a large amount of energy in a small volume.
Discharging
When you turn on a hot tap, cold mains water flows through a heat exchanger coil inside the battery. The stored heat from the PCM transfers to the water instantly, and the material solidifies again, releasing the heat and providing hot water on demand at a consistent temperature
